Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1990-05-30
1992-02-11
Tolin, Gerald P.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335177, 335 80, H01H 6702
Patent
active
050879030
ABSTRACT:
A seesaw electromagnetic switch for controlling a chain/forward/reverse current system includes a seesaw assembly and an exciter set. Springs are provided and disposed between the seesaw assembly and the exciter set to balance the seesaw assembly. Because of this balanced position, even if two coils parallelly disposed in the exciter set are incidently provided with current at the same time and thereby cause the seesaw assembly to swing, no current will flow through the main circuit and no short-circuit will occur in either the forward rotation circuit or the reverse rotation circuit, protecting the motor in use from burning out. The wiring is simplified and the volume of the electromagnetic switch is reduced by the closely and parallelly disposed coils of the exciter set, by the multiple terminals provided on top of an upper casing of the switch, and by the double-wall structure of the main casing of the switch which allows conductors to pass through side openings and a bottom space formed between the two walls of the main casing, connecting contacts at two opposite sides of the switch to form the forward circuit and the reverse circuit.
REFERENCES:
patent: 4286244 (1981-08-01), Schuessler et al.
patent: 4366459 (1982-12-01), Vitola
patent: 4496919 (1985-01-01), Fournier et al.
Donovan Lincoln
Tolin Gerald P.
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